So i have a 1988 rx-7 gxl N/A and the fpd went out so i replaced it with a 1991 fpd. I'm almost positive i hooked up all vacuums, and correctly. I wasn't sure what that little screw on top of the intake did and it seemed to change the idle a little but i didn't mess with it much till i knew what it did. it runs fine when im moving but at a idle it bounces a lot all between the 500rpm and 1000rpm lines sometimes almost stalls out. I can hear a light clanking sounds also a little bit when im sitting in the driver seat.